public QueryBase::count()
Makes this a count query.
For count queries, execute() returns the number entities found.
\Drupal\Core\Entity\Query\QueryInterface The called object.
Overrides QueryInterface::count
public function count() { $this->count = TRUE; return $this; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryBase.php/function/QueryBase::count/8.1.x